The American astronomer, astrophysicist, cosmologist and popular science scientist Carl Sagan once called the Earth "that little pale blue dot." But he was not the first. We owe the definition of Blue Planet to the first human beings who first saw it from space, astronauts.
To be more exact, it was the astronauts of the Gemini 11 spacecraft who first observed planet Earth from space. It was in August of 1966. Upon returning home they commented fascinated the colors that our planet had. They talked about the ocher of the deserts and the emerald color of the rainforests. But the blue of the seas and oceans predominated over all shades. From then on, astronauts who travel to space always talk about the Blue Planet when referring to Earth.
The photos taken from space have allowed the rest of us mortals to appreciate the predominance of blue on the surface of our planet. It is not strange, since large bodies of water occupy 75 percent of the earth's crust.
This little blue dot in the vastness of the Universe is our house. It is our known world, in which we live. It is the only home we know and that, for now, we will know, the only one that can house life. That is why we must take care of it and protect it, especially the rivers, seas and oceans, so that within several centuries the blue of the water remains the color that identifies us from space.
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